Types and Measures of Angles

This video tutorial explains how to classify angles based on their measures. It covers four main types: straight, right, acute, and obtuse angles. A straight angle is 180°, a right angle is 90°, an acute angle is between 0° and 90°, and an obtuse angle is between 90° and 180°. The video also briefly discusses angles greater than 180° and concludes with a suggestion to watch a follow-up video for practice.

What are the four basic types of angles?

• Acute, Obtuse, Reflex, Full

• Straight, Right, Acute, Obtuse

• Straight, Right, Acute, Reflex

• Right, Acute, Obtuse, Reflex

What is the measure of a straight angle?

• 360°

• 90°

• 180°

• 270°

Which angle is formed by perpendicular lines?

• Obtuse angle

• Right angle

• Acute angle

• Straight angle

What is the measure of a right angle?

• 135°

• 90°

• 45°

• 180°

Which angle type is exactly half of a straight angle?

• Acute angle

• Right angle

• Obtuse angle

• Reflex angle

What is the measure of an angle that forms a corner of a square?

• 135°

• 90°

• 180°

• 45°

Which angle type is formed when two rays are perpendicular?

• Obtuse angle

• Straight angle

• Right angle

• Acute angle

Which of the following is true about acute angles?

• They are less than 90°

• They are greater than 90°

• They are greater than 180°

• They are exactly 90°

An angle measuring 45° is classified as which type?

• Obtuse angle

• Acute angle

• Right angle

• Straight angle

Which angle type is always less than 90°?

• Right angle

• Straight angle

• Acute angle

• Obtuse angle